added fab.filter and fab.parse binary apps.

apps/fab.filter.js

@@ -0,0 +1,16 @@
+exports.summary = "Turns a function into a binary app that only sends responses that satisfy the function.";
+
+exports.app = function( fn ) {
+  return function( app ) {
+    return function() {
+      var out = this;
+      return app.call( function listener( obj ) {
+        if ( !obj || fn.call( obj, obj ) ) {
+          out = out.apply( this, arguments );
+        }
+
+        return listener;
+      })
+    }
+  }
+}

apps/fab.nodejs.http.js

@@ -18,14 +18,14 @@ exports.app = function( app ) {
           obj.headers || { host: loc.hostname }
         )
         .addListener( "response", function( response ) {
-          out({
+          out = out({
             status: response.statusCode,
             headers: response.headers
           });
 
           response
             .addListener( "data", function( chunk ) {
-              out({ body: chunk });
+              if ( out ) out = out({ body: chunk });
             })
             .addListener( "end", out )
             .setBodyEncoding( "utf8" );

apps/fab.parse.js

@@ -0,0 +1,9 @@
+var fab = { map: require( "./fab.map" ).app };
+
+exports.summary = "A binary app that converts JSON responses into objects.";
+
+exports.app = fab.map( function( obj ) {
+  var body = obj.body;
+  if ( typeof body == "string" ) obj.body = JSON.parse( body );
+  return obj;
+})